I honestly wouldn't breed the first two. They are too high white for my liking. Bred to the wrong rat, they could produce babies with incurable problems(megacolon being one of them). The beige hoodie is fine to use. The last one looks american or russian blue(bad picture) variegated. Huskies generally have a solid line down their sides without any speckling.

They need to be 5-6 months before breeding and 250g+. Males can be younger but they may not be fertile enough yet.